tolong dijawab yaa kalo bisa pake cara

Kalo sesuai dengan soalnya, gini sih, tapi ga tau deh.

a. 6/24 = (21/4)/21 = (28/4)/28

b. 4/20 = 5/25 = 6/30

c. 6/27 = 8/36 = 14/63

d . 6/8 = 15/20 = 24/32